diff --git a/Docs/README.hud b/Docs/README.hud
index 0906b65de..81a391a40 100644
--- a/Docs/README.hud
+++ b/Docs/README.hud
@@ -258,8 +258,8 @@ determined from <width>. The outer circle radius is changeable at runtime.
 
   <active-condition> ... true:  stadiametric (4.2.4.4)  (default)
                          false: standby (4.2.4.5)
-  <diameter>         ... float; diameter of outer circle relative to inner circle
-                         default: 2.0 (= twice as big)
+  <diameter-input>   ... input channel: diameter of outer circle relative to
+                         inner circle; default: 2.0 (= twice as big)